JLG 1100S Service Manual - Manual (Page 120)

SECTION 3 - CHASSIS & TURNTABLE
3-78 – JLG Lift – 3121256
5. At the rear of the main valve, remove the lift hose
from port #4. Immediately cap the line and port.
6. Attach suitable overhead lifting equipment to the
machine. Refer to Figure 3-51., Swing Bearing
Removal.
7. Use a suitable tool to scribe a line on the inner race
of the swing bearing and on the underside of the
turntable. This will aid in aligning the bearing upon
installation. Remove the bolts and washers which
attach the turntable to the bearing inner race. Dis-
card the bolts.
8. Use the lifting equipment to carefully lift the com-
plete turntable assembly from the bearing. Ensure
that no damage occurs to the turntable, bearing or
frame-mounted components.
9. Carefully place the turntable on a suitably supported
trestle.
NOTE: The swing bearing weighs approximately 300 lbs.
(136 kg).
10. Use a suitable tool to scribe a line on the outer race
of the swing bearing and the frame. This line will aid
in aligning the bearing upon installation. Remove the
bolts and washers which attach the outer race of the
bearing to the frame. Discard the bolts. Use suitable
lifting equipment to remove the bearing from the
frame, then move the bearing to a clean, suitably
supported work area.
Swing Bearing Installation
NOTE: The swing bearing weighs approximately 300 lbs.
(136 kg).
1. Using suitable lifting equipment, carefully lower the
swing bearing into position on the frame. Ensure the
scribed line of the outer race of the bearing aligns
with the scribed line on the frame. If a new swing
bearing is used, ensure that the spot with minimum
gear backlash (marked with yellow paint) is towards
the centerline of the swing drive (as close as the bolt
pattern will allow).
JLG INDUSTRIES RECOMMENDS THAT ALL REMOVED BEARING
BOLTS BE DISCARDED AND REPLACED WITH NEW BOLTS. SINCE
THE SWING BEARING IS THE ONLY STRUCTURAL LINK BETWEEN
THE FRAME AND TURNTABLE, IT IS IMPERATIVE THAT SUCH
REPLACEMENT HARDWARE MEETS JLG SPECIFICATIONS. USE
OF GENUINE JLG HARDWARE IS HIGHLY RECOMMENDED.
2. Apply a light coating of Loctite #271 to the new
bearing bolts, and loosely install the bolts and wash-
ers through the frame and outer race of bearing.
IF COMPRESSED AIR OR ELECTRICALLY OPERATED IMPACT
WRENCH IS USED FOR TIGHTENING THE BEARING ATTACHMENT
BOLTS, THE TORQUE SETTING ACCURACY OF THE TOOL SHOULD
BE CHECKED PRIOR TO USE.
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